Which three statements are true about connection strings and service names used to connect to an Oracle database instance?
A single database instance can support connections for multiple service names.
A service name is created by a listener.
A single connection string can refer to multiple database instances.
A connection string including a service name must be defined in the cnsnames.ora file.
A connection string must include the SID of a database Instance.
Different connection strings in the same tnsnames.ora file can contain the same service name, host and port parameters.
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